Discounts  are part  of the tickets/registrations.  In order to add any type of discount, please go to Event  Setup/Registration, you will find an option to add discount. This is the place  where any types of discount whether Code Discount, Bulk Discount , Flat  Discount would be added.     Click the "Add Discount " button which is on the top right corner  of the page and select the appropriate   discount option from the list in oder to add.  

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